/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gradle.kotlin.dsl.provider

import org.gradle.api.invocation.Gradle
import org.gradle.internal.InternalBuildAdapter
import org.gradle.internal.concurrent.Stoppable
import org.gradle.internal.event.ListenerManager
import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
import kotlin.reflect.KClass
import kotlin.reflect.full.companionObject
import kotlin.reflect.full.companionObjectInstance
import kotlin.reflect.full.functions
import kotlin.reflect.jvm.isAccessible


/**
 * Disposes Kotlin compiler environment once all scripts are compiled.
 */
class KotlinCompilerContextDisposer(
    private val listenerManager: ListenerManager
) : InternalBuildAdapter(), Stoppable {

    init {
        listenerManager.addListener(this)
    }

    override fun stop() {
        listenerManager.removeListener(this)
    }

    override fun projectsEvaluated(gradle: Gradle) {
        // TODO replace this reflective hack by direct compiler API invocation once available
        val compilerEnvClass: KClass<*> = KotlinCoreEnvironment::class
        val companionClass: KClass<*> = compilerEnvClass.companionObject!!
        val companionInstance: Any = compilerEnvClass.companionObjectInstance!!
        companionClass.functions
            .first { it.name == "disposeApplicationEnvironment" }
            .let { disposeFunction ->
                disposeFunction.isAccessible = true
                disposeFunction.call(companionInstance)
            }
    }
}
